There is a link about the problem with the retrofit. I have a 2/08 build and IT DID NOT WORK

I think (only circumstantial proof of this) that it is due to the TCU (BMW assist) being upgraded during the 3/08 builds. I've done the swap on a 7/08 build and it worked perfectly. So far myself, and another member w/ a 1/08 build can not get it to work, even with a complete re-coding of the car.

Thanks for the effort. I have a 01/08 build too. Was looking forward to getting this mod done. Oh well....